wow. of course you Perez would think this was "amazeballs" The 5 of these people are LAME….Ke$ha is disgusting. Usher is so full of his has been self. Justin is like 6 and not talented. Cheryl i have no idea who this lady is but you love to talk about how great she is ALWAYS and ONLY so i am guessing she sucks if you approve and Rihanna, wow…really? I dont think anything this person does is anything near "amazeballs"

Actually, this DJ did a very good job putting this together. However, these songs are not in the same key. I really have to listen to determine whether he transposed/altered pitch of vocals to work together or not. You'd think Perez, claiming that he knows so much about music and wanting to replace Simon Cowell as the top judge on AI, would have taken a close listen to the melody, etc. before posting how amazing it is.

That was from the summertime ball in wembely, wont some people in the US not know some of the people? like JLS, Alexandra Burke, Dizzee Rascal, Chipmunk, Tinie Tempah, Elie Goulding, Esmee Denters, Pixie Lott etc ??

Zayn previewed the duet by posting a black and white pic of himself with Swifty on his Instagram -- but hey, she is bestiez with his girlfriend Gigi Hadid, so it wouldn't be unusual that they hang out... But collab?!